Ebetter 义嘉泰科技 STK3331-A 环境光传感器

STK3331-A

Ambient Light Sensor and Proximity Sensor with Built-in IR LED

1. OVERVIEW

Description

The STK3331-A is an integrated ambient and infrared light to digital converter with a built-in IR LED and I2C interface. This device provides not only ambient light sensing to allow robust backlight/display brightness control but also infrared sensing to allow proximity estimation featured with interrupt function.

For ambient light sensing, the STK3331-A incorporates a photodiode, timing controller and ADC in a single chip. The excellent spectral response is designed to be close-to human eye. The STK3331-A is suitable for detecting a wide range of light intensity environment.

For proximity sensing, the STK3331-A also incorporates a photodiode, timing controller and ADC in the same chip. The spectral response of STK3331-A is optimized for wavelength 940nm infrared light. The STK3331-A provides programmable current setting to drive IR LED and employs a noise cancellation scheme to highly reject unwanted ambient IR noise.

The STK3331-A has excellent temperature compensation, robust on-chip refresh rate setting without external components. Software shutdown mode control is provided for power saving application. The STK3331-A operating voltage range is 1.7V to 3.0V.

Feature

 Integrated ambient light sensor, proximity sensor and infrared LED in one package.

Proximity Sensor

 16 bits resolution for proximity detection

 Built-in LED driver with flexible setting

– LED turn-on time : 7 steps IT

– LED current : 3.125 / 6.25/ 12.5 / 25 / 50 / 100 /150 mA

 Flexible interrupt setting

– Several interrupt modes meet application requirements.

– Flag modes are included.

– Intelligent persistence to speed up the response time : 1/2/4/16 times

 Low noise design

 High ambient light suppression

 940nm LED for STK3331-A.

Ambient Light Sensor

 Convert ambient light intensity to 16-bit digital data format

 3rd generation ambient light sensor which closes to human-eye response and suppress IR portion.

 Flexible digital settings

– Integration time : 7 steps IT

 Flexible interrupt setting

– Interrupt while out-of- window

– Persistence : 1/2/4/8 times

 Clear channel for different light source compensation.

General

 Fully digital control with I2C interface

– 1.7 ~ 3.6V I2C interface

 Low power design

– Standby mode

– Wait mode

 VDD wide operation voltage : 1.7~3.0V

 Excellent temperature compensation: -40 to 85°C

 Available package options: OLGA

– STK3331-A : 5 x 1.5 x 1 (mm)

 Lead-free package (RoHS compliant)

 Moisture Sensitivity Level 3

Applications

 Mobile Phone, Smart-phone, PDA